The PRE-73 DLX II is a one-channel vintage style microphone-, line- and instrument preamplifier. The signal path uses only discrete components like resistors, capacitors and transistors. The line and microphone input and the line output are transformer balanced, using three different transformers, each one optimized for its purpose.
This is the way audio components were built before integrated circuits became available. The subjective sound quality delivered by vintage equipment is often preferred over the one delivered by modern units, a situation that is even more obvious now when music is recorded with clean-sounding digital audio equipment.
The circuit used in the PRE-73 DLX MKII is similar to the preamp section in the classical 1073 module with a corresponding sound character that is warm, punchy, sweet and musical. These classic characteristics have been heard on countless recordings through the years and it is a versatile sound that works very well on most sound sources and in most genres. The essence of this sound is now available at a surprisingly low cost, making it available to nearly everyone.
- Vintage style electronics. No integrated circuits in the signal path.
- Custom made mic and line input and line output transformers and highpass inductor. The circuit board is prepared for the Carnhill transformers and high pass inductor.
- Traditional 1073-style gain switch that is also used to select the mic or the line input jack.
- Two combo XLR/TRS mic and line input jacks and separate output XLR and TRS jacks for flexible connections.
- Maximum gain on the mic input is 80 dB, enough to handle passive ribbon mics with quiet sound sources.
- Switchable impedance on the mic input, 1200 or 300 ohms. Changing the load impedance will change the tone of many mics.
- Gain range on the line input: -20 to + 10 dB.
- An active instrument input for guitar and bass that passes the signal through the mic input transformer, with selectable input impedance, hi-Z or 100 kohm, by an internal jumper.
- Switchable phantom power and absolute phase.
- Gain switch plastic knob and metal knobs for the other controls.
- The phantom power can deliver up to 10 mA according to the specification standard. The 6.8 kohm phantom power resistors are matched to within 0.1% to maintain good common-mode rejection in the circuit.